A British Web site calculates the answer for us - and it may surprise you. The authors state:
We are obsessed with wealth. But we gauge how rich we are by looking upwards at those who have more than us. This makes us feel poor.
We wanted to do something which would help people understand, in real terms, where they stand globally. And make us realise that in fact most of us (who are able to view this web page) are in the privileged minority.
Click on the link to compare your own income to that of most other people in the world. It's pretty eye-opening. You can ignore the appeal for donations to charity that follows the calculation, and find a deserving cause closer to home if you feel so inclined.